1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)dead_vnops.c 8.2 (Berkeley) 11/21/94 8 */ 9 10 #include <sys/param.h> 11 #include <sys/systm.h> 12 #include <sys/time.h> 13 #include <sys/vnode.h> 14 #include <sys/errno.h> 15 #include <sys/namei.h> 16 #include <sys/buf.h> 17 18 /* 19 * Prototypes for dead operations on vnodes. 20 */ 21 int dead_badop(), 22 dead_ebadf(); 23 int dead_lookup __P((struct vop_lookup_args *)); 24 #define dead_create ((int (*) __P((struct vop_create_args *)))dead_badop) 25 #define dead_mknod ((int (*) __P((struct vop_mknod_args *)))dead_badop) 26 int dead_open __P((struct vop_open_args *)); 27 #define dead_close ((int (*) __P((struct vop_close_args *)))nullop) 28 #define dead_access ((int (*) __P((struct vop_access_args *)))dead_ebadf) 29 #define dead_getattr ((int (*) __P((struct vop_getattr_args *)))dead_ebadf) 30 #define dead_setattr ((int (*) __P((struct vop_setattr_args *)))dead_ebadf) 31 int dead_read __P((struct vop_read_args *)); 32 int dead_write __P((struct vop_write_args *)); 33 int dead_ioctl __P((struct vop_ioctl_args *)); 34 int dead_select __P((struct vop_select_args *)); 35 #define dead_mmap ((int (*) __P((struct vop_mmap_args *)))dead_badop) 36 #define dead_fsync ((int (*) __P((struct vop_fsync_args *)))nullop) 37 #define dead_seek ((int (*) __P((struct vop_seek_args *)))nullop) 38 #define dead_remove ((int (*) __P((struct vop_remove_args *)))dead_badop) 39 #define dead_link ((int (*) __P((struct vop_link_args *)))dead_badop) 40 #define dead_rename ((int (*) __P((struct vop_rename_args *)))dead_badop) 41 #define dead_mkdir ((int (*) __P((struct vop_mkdir_args *)))dead_badop) 42 #define dead_rmdir ((int (*) __P((struct vop_rmdir_args *)))dead_badop) 43 #define dead_symlink ((int (*) __P((struct vop_symlink_args *)))dead_badop) 44 #define dead_readdir ((int (*) __P((struct vop_readdir_args *)))dead_ebadf) 45 #define dead_readlink ((int (*) __P((struct vop_readlink_args *)))dead_ebadf) 46 #define dead_abortop ((int (*) __P((struct vop_abortop_args *)))dead_badop) 47 #define dead_inactive ((int (*) __P((struct vop_inactive_args *)))nullop) 48 #define dead_reclaim ((int (*) __P((struct vop_reclaim_args *)))nullop) 49 int dead_lock __P((struct vop_lock_args *)); 50 #define dead_unlock ((int (*) __P((struct vop_unlock_args *)))nullop) 51 int dead_bmap __P((struct vop_bmap_args *)); 52 int dead_strategy __P((struct vop_strategy_args *)); 53 int dead_print __P((struct vop_print_args *)); 54 #define dead_islocked ((int (*) __P((struct vop_islocked_args *)))nullop) 55 #define dead_pathconf ((int (*) __P((struct vop_pathconf_args *)))dead_ebadf) 56 #define dead_advlock ((int (*) __P((struct vop_advlock_args *)))dead_ebadf) 57 #define dead_blkatoff ((int (*) __P((struct vop_blkatoff_args *)))dead_badop) 58 #define dead_valloc ((int (*) __P((struct vop_valloc_args *)))dead_badop) 59 #define dead_vfree ((int (*) __P((struct vop_vfree_args *)))dead_badop) 60 #define dead_truncate ((int (*) __P((struct vop_truncate_args *)))nullop) 61 #define dead_update ((int (*) __P((struct vop_update_args *)))nullop) 62 #define dead_bwrite ((int (*) __P((struct vop_bwrite_args *)))nullop) 63 64 int (**dead_vnodeop_p)(); 65 struct vnodeopv_entry_desc dead_vnodeop_entries[] = { 66 { &vop_default_desc, vn_default_error }, 67 { &vop_lookup_desc, dead_lookup }, /* lookup */ 68 { &vop_create_desc, dead_create }, /* create */ 69 { &vop_mknod_desc, dead_mknod }, /* mknod */ 70 { &vop_open_desc, dead_open }, /* open */ 71 { &vop_close_desc, dead_close }, /* close */ 72 { &vop_access_desc, dead_access }, /* access */ 73 { &vop_getattr_desc, dead_getattr }, /* getattr */ 74 { &vop_setattr_desc, dead_setattr }, /* setattr */ 75 { &vop_read_desc, dead_read }, /* read */ 76 { &vop_write_desc, dead_write }, /* write */ 77 { &vop_ioctl_desc, dead_ioctl }, /* ioctl */ 78 { &vop_select_desc, dead_select }, /* select */ 79 { &vop_mmap_desc, dead_mmap }, /* mmap */ 80 { &vop_fsync_desc, dead_fsync }, /* fsync */ 81 { &vop_seek_desc, dead_seek }, /* seek */ 82 { &vop_remove_desc, dead_remove }, /* remove */ 83 { &vop_link_desc, dead_link }, /* link */ 84 { &vop_rename_desc, dead_rename }, /* rename */ 85 { &vop_mkdir_desc, dead_mkdir }, /* mkdir */ 86 { &vop_rmdir_desc, dead_rmdir }, /* rmdir */ 87 { &vop_symlink_desc, dead_symlink }, /* symlink */ 88 { &vop_readdir_desc, dead_readdir }, /* readdir */ 89 { &vop_readlink_desc, dead_readlink }, /* readlink */ 90 { &vop_abortop_desc, dead_abortop }, /* abortop */ 91 { &vop_inactive_desc, dead_inactive }, /* inactive */ 92 { &vop_reclaim_desc, dead_reclaim }, /* reclaim */ 93 { &vop_lock_desc, dead_lock }, /* lock */ 94 { &vop_unlock_desc, dead_unlock }, /* unlock */ 95 { &vop_bmap_desc, dead_bmap }, /* bmap */ 96 { &vop_strategy_desc, dead_strategy }, /* strategy */ 97 { &vop_print_desc, dead_print }, /* print */ 98 { &vop_islocked_desc, dead_islocked }, /* islocked */ 99 { &vop_pathconf_desc, dead_pathconf }, /* pathconf */ 100 { &vop_advlock_desc, dead_advlock }, /* advlock */ 101 { &vop_blkatoff_desc, dead_blkatoff }, /* blkatoff */ 102 { &vop_valloc_desc, dead_valloc }, /* valloc */ 103 { &vop_vfree_desc, dead_vfree }, /* vfree */ 104 { &vop_truncate_desc, dead_truncate }, /* truncate */ 105 { &vop_update_desc, dead_update }, /* update */ 106 { &vop_bwrite_desc, dead_bwrite }, /* bwrite */ 107 { (struct vnodeop_desc*)NULL, (int(*)())NULL } 108 }; 109 struct vnodeopv_desc dead_vnodeop_opv_desc = 110 { &dead_vnodeop_p, dead_vnodeop_entries }; 111 112 /* 113 * Trivial lookup routine that always fails. 114 */ 115 /* ARGSUSED */ 116 int 117 dead_lookup(ap) 118 struct vop_lookup_args /* { 119 struct vnode * a_dvp; 120 struct vnode ** a_vpp; 121 struct componentname * a_cnp; 122 } */ *ap; 123 { 124 125 *ap->a_vpp = NULL; 126 return (ENOTDIR); 127 } 128 129 /* 130 * Open always fails as if device did not exist. 131 */ 132 /* ARGSUSED */ 133 dead_open(ap) 134 struct vop_open_args /* { 135 struct vnode *a_vp; 136 int a_mode; 137 struct ucred *a_cred; 138 struct proc *a_p; 139 } */ *ap; 140 { 141 142 return (ENXIO); 143 } 144 145 /* 146 * Vnode op for read 147 */ 148 /* ARGSUSED */ 149 dead_read(ap) 150 struct vop_read_args /* { 151 struct vnode *a_vp; 152 struct uio *a_uio; 153 int a_ioflag; 154 struct ucred *a_cred; 155 } */ *ap; 156 { 157 158 if (chkvnlock(ap->a_vp)) 159 panic("dead_read: lock"); 160 /* 161 * Return EOF for tty devices, EIO for others 162 */ 163 if ((ap->a_vp->v_flag & VISTTY) == 0) 164 return (EIO); 165 return (0); 166 } 167 168 /* 169 * Vnode op for write 170 */ 171 /* ARGSUSED */ 172 dead_write(ap) 173 struct vop_write_args /* { 174 struct vnode *a_vp; 175 struct uio *a_uio; 176 int a_ioflag; 177 struct ucred *a_cred; 178 } */ *ap; 179 { 180 181 if (chkvnlock(ap->a_vp)) 182 panic("dead_write: lock"); 183 return (EIO); 184 } 185 186 /* 187 * Device ioctl operation. 188 */ 189 /* ARGSUSED */ 190 dead_ioctl(ap) 191 struct vop_ioctl_args /* { 192 struct vnode *a_vp; 193 int a_command; 194 caddr_t a_data; 195 int a_fflag; 196 struct ucred *a_cred; 197 struct proc *a_p; 198 } */ *ap; 199 { 200 201 if (!chkvnlock(ap->a_vp)) 202 return (EBADF); 203 return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap)); 204 } 205 206 /* ARGSUSED */ 207 dead_select(ap) 208 struct vop_select_args /* { 209 struct vnode *a_vp; 210 int a_which; 211 int a_fflags; 212 struct ucred *a_cred; 213 struct proc *a_p; 214 } */ *ap; 215 { 216 217 /* 218 * Let the user find out that the descriptor is gone. 219 */ 220 return (1); 221 } 222 223 /* 224 * Just call the device strategy routine 225 */ 226 dead_strategy(ap) 227 struct vop_strategy_args /* { 228 struct buf *a_bp; 229 } */ *ap; 230 { 231 232 if (ap->a_bp->b_vp == NULL || !chkvnlock(ap->a_bp->b_vp)) { 233 ap->a_bp->b_flags |= B_ERROR; 234 biodone(ap->a_bp); 235 return (EIO); 236 } 237 return (VOP_STRATEGY(ap->a_bp)); 238 } 239 240 /* 241 * Wait until the vnode has finished changing state. 242 */ 243 dead_lock(ap) 244 struct vop_lock_args /* { 245 struct vnode *a_vp; 246 } */ *ap; 247 { 248 249 if (!chkvnlock(ap->a_vp)) 250 return (0); 251 return (VCALL(ap->a_vp, VOFFSET(vop_lock), ap)); 252 } 253 254 /* 255 * Wait until the vnode has finished changing state. 256 */ 257 dead_bmap(ap) 258 struct vop_bmap_args /* { 259 struct vnode *a_vp; 260 daddr_t a_bn; 261 struct vnode **a_vpp; 262 daddr_t *a_bnp; 263 int *a_runp; 264 } */ *ap; 265 { 266 267 if (!chkvnlock(ap->a_vp)) 268 return (EIO); 269 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp)); 270 } 271 272 /* 273 * Print out the contents of a dead vnode. 274 */ 275 /* ARGSUSED */ 276 dead_print(ap) 277 struct vop_print_args /* { 278 struct vnode *a_vp; 279 } */ *ap; 280 { 281 282 printf("tag VT_NON, dead vnode\n"); 283 } 284 285 /* 286 * Empty vnode failed operation 287 */ 288 dead_ebadf() 289 { 290 291 return (EBADF); 292 } 293 294 /* 295 * Empty vnode bad operation 296 */ 297 dead_badop() 298 { 299 300 panic("dead_badop called"); 301 /* NOTREACHED */ 302 } 303 304 /* 305 * Empty vnode null operation 306 */ 307 dead_nullop() 308 { 309 310 return (0); 311 } 312 313 /* 314 * We have to wait during times when the vnode is 315 * in a state of change. 316 */ 317 chkvnlock(vp) 318 register struct vnode *vp; 319 { 320 int locked = 0; 321 322 while (vp->v_flag & VXLOCK) { 323 vp->v_flag |= VXWANT; 324 sleep((caddr_t)vp, PINOD); 325 locked = 1; 326 } 327 return (locked); 328 } 329